Nintendo Network ID Question

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#1 Posted by -Vulpix- (2375 posts) -

Does anyone know how to make a new Nintendo Network ID preferable without having to reformat the 3DS or something?
Trying to use the 3DS store on my Sister's 3DS. but her ex boyfriend made the account so we don't the password or email that was used on it.

I already tried checking the Nintendo Network ID settings but need password for that or am I going to have to reset the system in order to make a new account?